arXiv subjects

Jairo Armijos

Publications and source records attributed to Jairo Armijos.

2 recordsLinked to original sources

arXiv2018

Magnetic field constraint in the outskirts of spiral galaxies

Based on CO(2-1) public data, we study the monoxide oxygen gas excitation conditions and the magnetic field strength of NGC 2841, NGC 3077, NGC 3184, NGC 3351 spiral galaxies. For their galaxy outskirts, we found kinetic temperatures in the range of $35 - 38 ~K$, CO column densities $10^{15} - 10^{16} ~cm^{-2}$ and H2 masses of $4 ~10^6 - 6 ~ 10^8 M_\odot$. An H2 density 1$0^3 cm^{-3}$ is suitable to explain the 2 sigma upper limits of the CO(2-1) line intensity. We constrain the magnetic field strength for our sample of spiral galaxies and their outskirts, evaluating a simplified expression of the magneto-hydrodynamic force equation. Our estimations provide values for the magnetic field strength in the order of $6-31 ~μG$.

astro-ph.GA↗

arXiv2017

The HI Distribution Observed toward a Halo Region of the Milky Way

We use observations of the neutral atomic hydrogen (HI) 21-cm emission line to study the spatial distribution of the HI gas in a 80$\degree\times~$90$\degree$ region of the Galaxy halo. The HI column densities in the range of \mbox{3--11$\times$10$^{20}$ cm$^{-2}$} have been estimated for some of the studied regions. In our map---obtained with a spectral sensitivity of $\sim$2 K---we do not detect any HI 21-cm emission line {above 2$σ$} at Galactic latitudes higher than $\sim${46}$\degree$. {This report summarizes our contribution presented at the conference on the origin and evolution of barionic Galaxy halos}.

astro-ph.GA↗